package com.feishi.core.util.poi.common;

import org.apache.poi.hssf.usermodel.HSSFCell;
import org.apache.poi.hssf.usermodel.HSSFRow;
import org.apache.poi.hssf.usermodel.HSSFSheet;
import org.apache.poi.hssf.usermodel.HSSFWorkbook;
import org.apache.poi.poifs.filesystem.POIFSFileSystem;
import org.apache.poi.ss.usermodel.Cell;
import org.apache.poi.ss.usermodel.CellStyle;


import java.io.File;
import java.io.FileInputStream;
import java.io.IOException;



/**
 * @version 1.0
 * @auth caixq
 * @time 18-5-22 14:26
 **/
public class ReadExcelForHSSF {

    public void read() {
        File file = new File("././POI/POI1.xls");
        if (!file.exists())
            System.out.println("文件不存在");
        try {
            //1.读取Excel的对象
            POIFSFileSystem poifsFileSystem = new POIFSFileSystem(new FileInputStream(file));
            //2.Excel工作薄对象
            HSSFWorkbook hssfWorkbook = new HSSFWorkbook(poifsFileSystem);
            //3.Excel工作表对象
            HSSFSheet hssfSheet = hssfWorkbook.getSheetAt(0);
            //总行数
            int rowLength = hssfSheet.getLastRowNum()+1;
            //4.得到Excel工作表的行
            HSSFRow hssfRow = hssfSheet.getRow(0);
            //总列数
            int colLength = hssfRow.getLastCellNum();
            //得到Excel指定单元格中的内容
            HSSFCell hssfCell = hssfRow.getCell(0);
            //得到单元格样式
            CellStyle cellStyle = hssfCell.getCellStyle();

            for (int i = 0; i < rowLength; i++) {
                //获取Excel工作表的行
                HSSFRow hssfRow1 = hssfSheet.getRow(i);
                for (int j = 0; j < colLength; j++) {
                    //获取指定单元格
                    HSSFCell hssfCell1 = hssfRow1.getCell(j);

                    //Excel数据Cell有不同的类型，当我们试图从一个数字类型的Cell读取出一个字符串时就有可能报异常：
                    //Cannot get a STRING value from a NUMERIC cell
                    //将所有的需要读的Cell表格设置为String格式
                    if (hssfCell1 != null) {
                        hssfCell1.setCellType(Cell.CELL_TYPE_STRING);
                    }

                    //获取每一列中的值
                    System.out.print(hssfCell1.getStringCellValue() + "\t");
                }
                System.out.println();
            }
        } catch (IOException e) {
            e.printStackTrace();
        }
    }

    public static void main(String[] args) {
        new ReadExcelForHSSF().read();
    }
}
